You can buy the Hunter Pro-C, 4-zone model on Amazon for $92. If it is in the garage, you need the interior (not exterior) unit. If you buy the exact same model that you already have, it looks like you can replace it by removing 2 mounting screws and disconnecting a few wires. I would take a photo of the existing unit wiring before disconnecting the wires. If mine ever fails, I think I will attempt a DIY project.
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